Telegraph transmission system



Jam 16, 11945. L. M. POTTS 2,367,427

TELEGRAPH TRANSMISSION SYSTEM Original Filed Dec. so, 1957 5 Sheets-Sheet 1 FIG.

INVENTOR LOUIS M. POTTS BYM ATTOR EY 'OUT-OFPHA SE SIGNAL J 316 15. -rs 2,367,427

TELEGRAPH TRANSMISS ION SYSTEM Original Filed Dec. 50, 1957 5 Sheets-Sheet 2 INVENTOR. LOUIS M. POTTS ATTO EY.

FIG. 2

Jan. 16, 1945. L. M. POTTS TELEGRAPH TRANSMISSION SYSTEM Original Filed Dec. 30, 1957 5 Sheets-Sheet 5 NON INVENTOR LOUIS NI. POTTS mmm wmo.

ATT RNEY Jim. 16, 1945. L. M. POTTS TELEGRAPH TRANSMISSION SYSTEM Original Filed Dec. 30, 1937 5 Sheets-Sheet 4 INVENTOR.

LOUIS M. POTTS TTORNEY.

Jan. 16, 1945.. L. M. POTTS 2,367,427

FIG.8

INVENTOR. LOUIS M. POTTS BY I ATTORNEY.

Patented Jan. 16, 1945 TELEGRAPH TRANSMISSION SYSTEM Louis M. Potts, Evanston, Ill., assignor to Teletype Corporation, Chicago, 11]., a corporation of Delaware Original application December 30, 1937, Serial No. 182,422. Divided and th s application October 17, 1942, Serial No. 462,360

14 Claims.

The present invention relates to telegraph transmitters and transmission systems and more particularly to telegraph apparatus and systems including arrangements for establishing and correcting the phase relationship between transmitting and receiving machines.

This application is a division of United States copending application Serial No. 182,422, which matured into Patent No. 2,308,539 on January 19, 1943.

The principal object of the present invention is to provide, in a telegraph signaling system in which a variable number of character signals may be transmitted within a single cycle, apparatus for periodically or predeterminedly transmitting to the receiving apparatus of the system an impulse which serves to phase said apparatus with the transmission of the signal impulses which represent the characters.

A further object of the invention is to provide apparatus for adjusting the phase relationship between the signal generating apparatus of a transmitter and its power operating mechanism where the latter is driven from a regulated alternating current.

In accordance with illustrated embodiments, there are featured several methods of generating periodic phasing impulses which are effective to produce phase correcting responses upon receiving apparatus such as printing telegraph of the type illustrated in U. S. Patent No. 2,249,040. The proposed improvement has particular application in signaling systems in which all of the signals have a constant period or cycle and in which the signal characteristic is produced by modifying the electrical characteristic, at an interval during the sgnal cycle. At the receiving station, apparatus is provided which is specially respon- *ive t this modified condition in the signal cycle. Accordingly, it is to be understood that even slight discrepancies may affect the signal character and that therefore, it is vitally important to establish with a relatively high degree of accuracy the phase relationship between transmitting and receiving station apparatus; that is, the coincidence between signaling cycles of the transmitting apparatus and the receiving apparatus.

For a general understanding and illustration of typical transmitting apparatus designed to operate in accordance with systems herein under contemplation reference may be had to U. S. Patent No. 2,308,539, mentioned above, of which the instant application is a division. Moreover, in order to simplify the explanation of that portion of the system which relates to the particular subject under discussion, reference will be had to this copending application and to the aforenamed U. S. patent for specific knowledge concerning the apparatus.

Transmitting apparatuses are proposed, which,

for the purposes of the present disclosure, have been especially designed in contemplation of a total of but forty selective possibilities or functional operations. This number happens not to exhaust the total number of selective possibilities afforded by a six unit permutation code of the Baudot class which afiords sixty-four fundamental selective possibilities. Accordingly, a further objective of the disclosed system and one which is covered in the aforementioned copending application, is the provision of apparatus for translating from a six unit code to one of the type herein contemplated including means for assuring that signal transmission may continue by advancing the control form or tape even upon the occurrence in the tape of any of the code perforations which constitute tlfe excess twentyfour signals of the total sixty-four that have no correspondence to the forty signals of the instant system of transmission.

For a more comprehensive understanding of the present invention, reference will now be had to the following detailed specification and to the accompanying drawings in which like reference characters designate corresponding parts throughout and in which,

Fig. 1 is a theoretical wiring diagram illustrating schematically an electrical adaptation of a permutation code transmitter adapated to generate signals and phasing impulses of the class contemplated Fig. 2 is a perspective view with parts broken H away featuring a mechanical embodiment of transmitter and signal translating apparatus including a selector mechanism for reproducing signals and phasing impulses of the class contemplated.

Fig. 3 is a detailed fragmentary view of a portion of the selector mechanism featured in the mechanical embodiment of apparatus utilizing the present invention and illustrated in Fig. 2;

Fig. 4 is a schematic circuit diagram employing symbolic representations of the apparatus and featuring the method of circuit control which Y may be employed in connection with a transmitter of the type illustrated in Fig. 2;

Fig. 5 is a fragmentary detail elevation, partially in quarter-section, illustrating the distribution of cams for controlling the apparatus featured in Fig. 2;

Fig. 6 is a sectional detail view taken along a plane traversing the selecting mechanism of Fig.2;

Fig. 7 is a detailed perspective view of the selector arm and its butterfly lever also visible upon the selector pin barrel shaft of Fig. 2;

Fig. 8 is an irregular transverse sectional view of the apparatus shown in Figs. 2 to 7 having various parts broken away to reveal the interior structure; and

Fig. 9 is a graphic representation of the type of character selecting signal employed in operating the structural embodiment of the present invention, and illustrates the coincidence of the wave cycles of the alternating current with the several character elements.

Referring now more particularly to the accompanying drawings, attention is first directed to the electrical embodiment featured in Fig. 1, which will for convenience be referred to as the preferred system. Reference character I2I designates a rotary transmitter having two segmented rings I22 and I23 together with related solid rings designated I24 and I25. Each of the rings I22 to I25 is served by an individual contact brush I21, I28, I29, or I3I of which brushes, those designated I21 and I29 are bridged by an electrical connector I31 and those designated I28 and I3I by another conductor I26. The segmented rings I22 and I23 are divided into fortythree mutually insulated segments, and each one of forty of the segments of ring I22 is electrically connected over an individual line to a contact point of a selective bank which will now be described in detail.

Each one of the general class of segments designated from one to forty in the segmented ring I22 is connected over an individual line IOI with an extreme contact point of a fan selector circuit, Fig. 1, generally designated I02, and subjected to the control of a set of selector magnets I03 which are energized in accordance with the operation of the record sensing apparatus I04 which effects the positioning of the several armatures of said magnets I03. As these armatures are placed rightwardly or leftwardly in accordance with the energization of their associated magnets I03 an individual selective path is estab lished between a particular one of the forty distributor segments of ring I22 and one or the other of the two principal conditioning circuits I13 or I14.

The afore-mentioned principal circuits I13 and I14 are controlled by a pair of twin relays I59 and I 51. respectively. Both of these relays are comprised of an energizing and a locking winding, each energizing winding being supervised over a control circuit H! or I10. Circuit I is connected to alternate ones of the forty segments in ring I23 while relay I51 is controlled over a circuit I1I connected tothe intermediate alternate segments of said ring I 23.

As brush I28, which bridges ring I23 with ring I25, sweeps across the segments of its distributor ring, it encounters in alternate succession segments for establishing or preparing the control circuits HI and I10 of the twin relays I59 and I51. The principal object of providing this arrangement in distributor I2I is to assure that the path over which the selecting impulse is subsequently transmitted through segmented ring I22 is fully established before such a time that the particular impulse is started through the selector I02. The segments of ring I22 align with the segmented ring I 23 and are connected over lines IOI with different contacts of the fan circuit selector I02. Specifically, whereas segment No. 1 of ring I22 traverses through the selector fan I02 from the uppermost extremity of the circuit arrangement, Fig. 1, down through the circuit exiting over line I13, segment No. 2 continues over an oppositely extending path IOI upwards through the fan circuit I02 and out over line I14. Again segment 3 of ring I22 continues downwardly through the fan circuit I02 as did segment 1, etc., with alternate segments traversing the selector in corresponding manner.

The segment of ring I23 which aligns opposite segment No. 1 of ring I22 is connected over wire I1I conditioning that half of the selector circuit I02 which does not relate to the armatures aifected by circuit IOI of segment No. 1. Hence the preparation by supervisory twin magnet I51 is conditioning for selective operation the even segments 2, 4, 6, 8, etc., of ring I23, and correspondingly while brush I28 is traversing the odd segments 1, 3, 5, and 7 of ring I23, brush I21, though it may be engaging the corresponding odd segments of ring I22, cannot at any particular instance complete a circuit until it encounters the even segments. In this way there is assured the complete and full length signal transmission of 'each impulse preventing thereby the inadvertent foreshortening or clipping of the signal impulses.

Once during each cycle of rotation, relay I34 is energized during a special impulse interval of the cycle when brush I21 engages said segment I32. As a result, an impulse is sent out over line 69 because the armature I38 of relay I34 is pulled up to engage its contact I39 extending negative battery to the main line over conductor I. In accordance with one contemplation of the proposed system these negative impulses, differing as they do in electrical characteristic from the purely selecting impulses which are positive, serve to effect a periodic phase controlling function.

Normally, ground, through resistor I43 is connected through contact I44, line I45, armature I46, and its contact point, line I41 to the outgoing communication line 69, but upon the energization of phasing relay I34, the ground through contact I44 is removed simultaneously with the closure of armature I38 with its contact I39. Positive signaling impulses representing intelligence characters are introduced over line 69 under the control of the principal signaling relay I42 and they originate at the positive battery I49.

Armature I46, upon being attracted to the front contact point I 5I, is at the same time withdrawn from its back contact, which is in communication with the aforedescribed ground circuit, so that upon the operation of either, synchronizing relay I34 or signaling relay I42, it will be seen that normal ground is removed from the line circuit to permit of the issuance of plus or minus impulses for signaling or synchronizing purposes as the case may be.

Principal signaling relay I42 operates in series with a supervisory relay I52, the latter having two windings. One of its windings is connected over line I53 with the winding of principal signaling relay I42 whose other terminal is connected to grounded battery. The winding of relay I52 receives its energizing impulse over a line I54 which at junction I55 connects with one terminal branch I56 under the supervision of the right-hand twin relay I51 and another terminal branch I58 which is under the supervision of a left-hand twin relay I59. The twin relays I51 and I59 are energized successively as the distributor brush I28 sweeps across the segments of ring I23.

Affecting the other winding of supervisory relay I52, a locking circuit is traceable from ground through armature I6I and its associated front contact, secondary winding of relay I52, line I62 to the junction I63 at which point branches of the locking circuit continue over line I84 to the magnet 43 to ground. -Twin relays I51 and I59 are energized over lines HI and I10, as has been said, each of which lines is connected with a series of alternate segments in ring I23.

The arrangement illustrated whereby the segments of ring I23 are connected alternately to the twin relays I51 and I59 exemplifies an adaptation for permitting the practice of conditioning each segment of a distributor immediately before the arrival of its period of transmission. Then, following the energization of one or the other of the twin relays, ground is carried over the particular circuit established through the translator fan I02, one of the lines I13 or I14 through the armature I15 of relay I59, or the armature I16 of relay I51, and its respective contact point branch line I58 or I56, junction I55, line I54, to the energizing winding of relays I52 and I 42, then to grounded battery, causing to be energized both the supervisory relay I52 as well as the principal signaling relay I42.

It will be noted from Fig. 1 that other features M echanical modification In Figs. 2 to 8, there is illustrated an embodiment of the present invention in which mechanical agencies perform the functions, which in the above form employed solely electrical relays. The reference character 20I denotes a supporting base and reference character 202 a record reader.

Several shafts are supported endwise by the side frames 203 and 204 of the record reader, among which is a principal supporting shaft 205 that carries pendulously a set of feeler levers 206. All of the feeler levers are identical in contour and through a circular opening 201 in the several outside levers there extends a rod 208 which serves to limit the degree of reciprocal movement permitted to each one of the levers 206.

An individual spring 209 connecting an integral ear ZI I of each lever with an anchor plate 2I2 imparts a counterclockwise influence so that the sensing pins 2I3 of the several levers 206 which are .carried upon an uppermost extremity of their arms 2M seek to protrude through guide perforations of the bottom guide plate 2l5 and also through corresponding perforations in the top guide plate 2I6 which is spaced from the bottom guide plate 2I5 by an amount sufficient to permit the free passage of tape therebetween. As a strip of control form of tape having transverse perfora- III) tions thereon is advanced between the aforedescribed top and bottom guide plate, the intermittent action of sprocket wheel 2I1 causes successive rows of the transverse perforation to be presented so that the sensing pins 2I3 of the several feeler levers 206 are aligned with said perforations or with the unperforated areas when no perforations occur in any particular instances.

Sprocket wheel 2" is carried u on a rotary shaft 2I8 journaled in the side frame 203 and 204. A ratchet wheel 2I9 also secured to shaft 2I6 is engaged intermittently by the reciprocating tape feed pawl 22l whose supporting lever 222 is pivoted on a shaft 223 so that for each downward movement of pawl 22I under the influence of its lever return spring 224, ratchet wheel 2I9 as well as the other members of shaft 2I8 are rotated counterclockwise one tooth distance at a time. feeding the perforated tape intermittently at each operating cycle.

Lever 222 has been shown as part of a twoarmed assembly including a power actuated arm 225 whose follower roller 226 engages the periphery of an actuator cam 221 and imparts ,through the adjustment screw 228 the aforedescribed reciprocal motion in opposition to restoration spring 224. Cam 221 is one of several cams carried upon a principal cam shaft 229 which is driven in a clockwise direction, as viewed in Fig. 2, by a driving worm 23I integrally formed with bushing 232 which is secured to the rotor shaft of a speed-governed electric motor 233.

The driving worm 23I meshes with a driven wheel 234 having integrally associated with it the driving element 235 of a jaw clutch whose driven section 236 is urged by a spring 231 into driving engagement with the drive portion 235. Member 236 is free to be moved upon shaft 229 in a longitudinal direction but is restrained againstrotation independently therefrom because of its tongue 238, Fig. 5, which fits into a corresponding groove of the bushing 239 held rigid on shaft 229.

The motion, which is continuously imparted to drive member 235, is communicated to the shaft 229 through the driven clutch member 236 when the teeth of the clutch members are in mesh, but this engagement is cyclically withheld by reason of the retention, against a cam surface24 I of a lug 242 integrally formed with the driven section 236, Fig. 6.

The rotation of shaft 229, tends, through the engagement of lug 242 with the cam surface 2, to withdraw continuously driven clutch member 236 against the influence of spring 231 which holds shaft 229 at rest, but permitting the driving member 235 of the clutch to rotate continuously. When the arm 243, within which the cam surface is formed, is withdrawn from the path of lug 242 as it is compelled to do by a pring 244, driven sleeve 236 is immediately thrust into engagement with the driving sleeve 235 whereupon shaft 229 is started into a cycle of rotation. Before one revolution has been completed by the shaft 229, however, a cam 245, Fig. 5, carried thereby engages with its apex the follower roller 246, Fig. 6, carried upon a depending portion 241 of arm 243. Th s urges the latter member clockwise about pivot 248 returning it to its original position, as illustrated in Fig. 6, whereat the lug 242 again encounters the side cam projection 24I which withdraws the driven portion 236 of the clutch arresting the shaft 229 upon the completion of its cycle.

The effective or clutch separating position of arm 243 is maintained against the influence of spring 244 by the shouldered extremity 249 of an armature lever 25! pivoted at 252 and spring urged in a clockwise direction to be moved oppositely by its control magnet 253, the windings of which are also illustrated in Fig. 4. Through the above-described cyclicinterruption of shaft 229, the progress of the record reader is accordingly controlled so that the stepping of the tape may be made to correspond with the advancement of the transmitting mechanism. The periodic impulses for energizing control magnet 253 are generated by a revolving contact lever 254, Fig. '7, integrally associated with a butterfly 255 pivoted upon the rock shaft 256. Revolving contactor 254 is preferably electrically connected to the revolving arm 251 but if preferred it may be insulated from its supporting members. The extremity of contactor 254 is urged into engagement with a continuous contact ring 258, Fig. 8, when the butterfly 255 which is normally biased by a torsion spring 259, encounters one of the selectable rods 26f, which has been moved into selective position. Ring 258, is electrically insulated from its supporting structure, as indicated in Fig. 8, but is connected over by-wire 262 (Fig. 4) with a circuit for energizing the afore-described record reader shaft release magnet 253.

In Fig. 2 there may be noted several elements which are carried upon selector shaft 263 as well as some carried upon its sleeve 264. Another driving worm 265 integrally associated with the afore-described bushings 232, meshes with the worm wheel 266, which is floated between the friction discs 261 of a friction clutch assembly formed between a metallic disc 268 integral with the sleeve 264 and a tension disc 269 longitudinally movable upon sleeve 264 and adapted to be urged by a tension or compression disc 21l in the direction of the stationary disc 268. The tension of spring 211 which may be adjusted and then checked by tightening f the adjustment nuts 212, determines the degree of frictional embrace of driven wheel 266 by the friction discs 261 and any resistance to movement greater than this adjustment will permit, may .cause said wheel 266 to slip between the friction washers in the manner of conventional friction clutches Well known in the art of printing telegraphy.

In addition to its afore-described performance of driving sleeve 264, worm wheel 266 also serves to drive a reduction coupler comprised of a driven wheel of major diameter designated 213 and driving wheel of minor diameter designated 214, Fig. 2, the latter in turn meshing with a driven wheel 215 secured by a set screw to the shaft 263. The drive through coupler 213-214 is a positive one as distinguished from the frictional driving connection between Worm wheel 266 and sleeve 264. Also, it is to be noted that by reason of the reduced gearing through coupler 213-214, shaft 263 is positively driven at a slower speed while sleeve 264 is frictionally driven in the same direction but at a somewhat higher rate of speed, being directly associated with the driven wheel 266.

A stud 216 extends from shaft 263 in the path of a horizontally projecting lug 211 integral with the sleeve 264. Sleeve 264 may be moved at a speed greater than that at which shaft 263 is moved, but only until projecting lug 211 en counters stud 216. Thereafter, the two members, namely, shaft 263 and sleeve 264, may travel in unison, the frictionally driven and faster sleeve 284 being held back to the rate of speed established by the positively driven and slower shaft 263.

The principal purpose of sleeve 264 is to drive the revolving selector arm 251 which seeks out the selected one of the several rods 26! and through its butterfly 255 effects a setting upon the storage ins 218. The principal purpose of shaft 263 is to drive the transmitter arm 219 whose rotating bell crank 28 I is movable about its pivot 282 when either of its tracker arms 283 or 284 encounters a conditioned pin 218 which are displaced by the selector butterfly 255. In practice, selector shaft 263 and its arm 219 rotate continuously while sleeve 264 and revolving arm 251 rotate intermittently in accordance with each election when one of the extremities i083 of a selectable element 261 is presented into the path of the projection I084, Fig. 3, of the butterfly 255. The stopping of arm 251 is accordingly momentary, as will be explained later, and because of its greater speed, as aforeexplained, arm 251 is capable f overtaking transmitter arm 219 until the projecting lug 211 encounters the stud 216.

When the number or frequency of interruptions of seeker arm 251 as above described is sufficient to so delay its progress as to cause arm 219, which is positively driven by shaft 263 to overtake arm 251 which is frictionally driven together with sleeve 264, Fig. 2, and if thereafter arm 251 is positively blocked by one of the extremities I083, acondition might obtain whereat pin 216 which travels as an integral part of arm 219, overtakes the projection 211 which is an integral part of arm 251 and attempts to continue thereafter and is forced and possibly shorn off. To prevent this condition from occurring, a cam 285, Figs. 2 and 7, has been provided which is so arranged that the cam apex will encounter one arm 281, Fig. 8, of a bell crank whose other arm 288 is disposed in front of seeker projection I084, Fig. '1, and beneath the rod extremities i083. In this way, when shaft 263 assumes the position whereat slow moving but positively driven transmitter arm 219 is about to overtake the rapidly driven but momentarily blocked selector arm 251, bell crank 281-488 will first encounter the cam apex 285 which will then cause said bell crank to cam out the selected pin 26| an instant before the time at which pin 216 would collide with projection 211. As a result, the selector arm 251 is not then arrested by the particular pin 216 but instead is permitted to regain its lead in advance of the angular position of the transmitter arm 219. A circumstance such as that just described may result when the chance succession of characters happens so close together in terms of the arrangement of selectable pins 26! that arm 251 is repeatedly arrested after but short intervening movements between selections.

Camming out of the pins 26l from out of the path of arm 251 permits the latter to resume its rotation and to be far enough in advance of the oncoming transmitter arm 219 to prevent collision. It is to be noted that under such a circumstance, any pin 26l may already have performed its selective function, and that accordingly, the signal impulse which corresponds to such a pin will have been transferred to one of the storage pins 218.

Bell crank 281288 is pivoted upon a pin which passes through a slotted sidewardly extending arm 289 integrally formed with the selector arm 251, as is best illustrated in Fig. '7. In this illustration, also, there may be noted the longitudinal pivot shaft 258 upon which is carried the butterfly 255 and which is journaled at 292 and 293 in rigid portions of the arm 251. g

The afore-described revolving contactor 254 is preferably secured as at 295, Fig. 7, to the arm 251, and at its mid-portion, rests against the flattened clearance surface of longitudinal pivot 253. Thus, it will be noted that contactor 254 being constructed of resilient spring metal, serves as an electrically conductive contacting element for engaging the surface of continuous ring 258.

As may be viewed in Fig. 2, shaft 253 and sleeve 264 together with their integrally associated members, rotate in a clockwise direction. Just outside the radial path described by seeker projection I083 as it is rotated together with its supporting arm 251, are the several extremities I083 of the individually selectable rods 26I during the time that they are out of selector position. The several rodsare preferably supported in a floating condition within individual alignment of slots in disc 295, 296, and 291, which slots are parallelly arranged along the several discs and spaced radially from each other.

The selectable elements 26I are similarly bent as may be seen in Fig. 2 to collectively provide retention to a pair of garter springs 308 and 309 which repose within the peripheral clearance afiorded by said alignments while the garter springs in turn, serve to maintain the several selectable elements 26! under centripetal tension. Each of the elements 26I terminates with a slightly upturned rearmost section disposed with sumcient clearance behind the rearmost plates 295 so as to afford a space therebetween to receive a garter spring 3I3 similar to the tensioning garter springs 308 and 309 afore-mentioned but serving in this instance to prevent accidental longitudinal displacement of any one of the selectable rods 23L Between the two foremost partitioning elements 290 and 291, there are supported for limited reciprocal movement a set of circular selecting discs, in the instant case six in number, indicated 3M, Fig. 8, as well as a stripper disc. The peripheries of the several discs 3I4 are provided with a systematic distribution of obtuse angular notches. Each disc 3N is capable of limited reciprocal movement throughout an angular distance which corresponds to the spacing between adjacent selectable rods 26I. The arrangement of said notches in the several discs 3% is in accordance with the permutation code so that for each possible disposition of the several of said discs 3M there is afforded to one of the selectable elements 26 I, a transverse clearance by reason of a transverse alignment of said peripheral obtuse notches.

As is well known to those acquainted with permutation selecting systems, the total mathematical selective possibilities afforded by a six unit permutation code selector is sixty-four. To accommodate all of the selective functions requisite to the operation of a printer such as that illustrated in U. S. Patent No. 2,249,040, all of the sixty-four possibilities are not required to be used, but instead only forty, leaving unused a total of twenty-four selective possibilities. Accordingly, though the six discs, 3I4, are mathematically capable of affording sixty-four different selections, there are provided only forty selectable rods 23L It will be understood, therefore, that in response to twenty-four of the total variations of sixty-four selective possibilities, no selective response will be evident among the group of elements 28L In peripheral registration with each of the code discs 3|4 as well as with the stripper disc, every selectable rod 26I is provided with an individual collar 3I6 for the purpose of mlnlmizmg the friction therebetween and so that the discs 3I4 may be reciprocated with less effort. The

0 extremities I083 of the several selectable rods 26I are slightly undercut so as to provide a shoulder. This practice permits of the maintenance of closer tolerances between the several extremities I083 and the rotatable elements carried by the arm 251 which traverses the proximity just beneath or inside of the circular arrangement of said extremities I083.

A plate 3ll is supported for limited rotation beneath the extremities I083 and its periphery is studded with a. plurality of square shouldered projections 3I8 angularly spaced to register each beneath one of the extremities I083. An upwardly and leftwardly projecting arm 3|9, formed as a continuation of certain ones of the square shouldered projections 3I8, is disposed so that its foremost portion rests against one element of a contact pair 32! normally tensioned to remain open, but held in contactual engagement by said arm 3I9 during certain conditions of operation which will now be described.

A return spring 322, Fig. 8, one end rigidly anchored to a stationary portion of the unit, imparts a clockwise torque to plate 3 mamtaining the latter member in the condition illustrated in Fig. 8, or in what may be termed its normal position. When, thereafter, in response to a certain disposition of the code discs 3, a selective clearance is aiforded to one of the rods 26I, the latter is forced centripetally under impetus of its garter spring 308 or 309. The full movement of an element 28I accordingly is not instantly permitted, due to the blocking thereof by its engagement with one of the lugs 3I8. Briefly thereafter, plate 3" is rocked counterclockwise when the extremity 323 of an arm integrally formed with ball 324 engages 8. lug which extends sidewardly from the afore-described arms 3I9. The extremity I083 of the particular selected rod 26I is then permitted to continue farther and as 50 it does so it becomes a barrier to the return (clockwise) of disc 3I1 until such a time that it is restored by the stripper disc.

Ball 324 is operated as one of the incidents of the record reader unit and its operation may occur at a time in the cycle sufliclently in advance of the signal transfer and restoring operations so that if meanwhile one of the rods 28I is selected its extremity I083 will thereafter bar the return movement of disc 3I1, causing the latter to be retained in its counterclockwise extreme position and maintaining .the contact 32I closed throughout the ensuing cycle of operation. It is to be noted that the retention of disc 3I1 in its counterclockwise position is a condition responsive to those operations only which result in the selection of one of the rods 28I, and that at other times when no rod 2BI is selected as is the case if one of the afore-mentioned twenty-four unused permutation codes occur, then plate 3I1 will be 70 permitted to return together with its actuating bail 324 allowing the contact pair 32I to close.

The storage pins 218 correspond in number and position to the selectable element 26I. The

pins 218 are distributed in two circular rows and 75 also in staggered succession. A garter spring 325 is tensioned around the inner circle of pins 218 and a similar spring '326 encircles the outer row of pins. Each signal storage pin has at about its center an angular ridge 321. The tension of the springs 325 and 326 serves to detent its associated circular row of storage pins in one or the other of two possible longltudinal positions. The normal position of said pins 218 is the one as illustrated in Fig. 2, but when the butterfly 255 is deflected as portrayed in Fig. 3, as a result of having encountered a selected extremity 1083 of one of the pins 261, then one or the other of the vanes 328 or 329 is brought against the inner extremity of a storage pin 218 displacing the latter member longitudinally whereat it is retained by its associated afore-described garter spring 325 or 326.

' As a consequence of an encounter with a protruding storage pin 218, the instant when transmitter arm 219 traverses the proximity of said selected storage pin, one or the other of its tracker arms 283 or 284, traveling clockwise with the transmitter arm 219 is caused to be cammed toward the axial center of rotation rocking the bell crank lever 281 about its pivot 282 so as to force the projection 331 thereof against the insulated block 332 and opening the contact pair 333, see also Fig. 2 which then causes an open line signal condition of measured length to be established momentarily.

There is thus produced a signal condition sent out over the line 334, following which a restoring vane 335 integrally associated with the arm 219 and presented at an angle as best indicated in Fig. 2, thereupon encounters the cond.tion pin 218 endwise, forcing it back against the holding tendency of its associated garter spring 325 or 326 and returning it to its normal position. It is to be noted that the sideward encounter of one of said storage pins 218 by the tracker arm 283 or 284 will not displace said pin because the force applied to the pin is transversely of its direction of movement. Thereafter a gentle camming action on the part of vane 335 applied endwise instantly depresses the condition pins 218 without so much as retarding the regular cyclic movement of the transmitter arm 219.

Attention is now again directed to the record reader mechanism 202, Figs. 2 and 8, where there was described that the feeler levers 206 present their feeler pins 213 to successive transverse areas of a control form cyclically. The sidewardly extended projections 331 are formed integrally with each one of the levers 206. The bail rod 338 traversing the proximity beneath said projections 331 forms part of a yieldable bell crank assembly pivoted on shaft 339 and actuatedby the afore-described feeler lever operating cam 221 upon whose periphery there rides a follower roller 341 which is associated with another arm of said internally yieldable bell crank assembly.

The lowermost portions of feeler levers 206 are formed with a pair of opposite shoulders 342 and 343, Fig. 8, which, as each feeler lever 206 is presented for tape sensing operation, may assume a so-called marking (cpunter-clockwise) as viewed in Fig. 8, or spacing (clockwise) position. Beneath the projecting shoulders 342 and 343 are a set of transfer levers 344 of generally T-shaped conformation carried on a common pivot rod 345 with each lever associated with and moving' in the same plane as one of said feeler levers 206. A pair of upwardly extending projections 346 and 341 is integrally formed with each transfer T- lever 344 and these projections are spaced somewhat farther apart than are the projections 342 and 343 from each other so that in accordance with each position of a lever 206 one of the up standing projections 346 or 341 may collide with its projection 342 or 343 to the exclusion of the other one.

The other one of the two projections avoids direct engagement with its cooperating projection and instead swings around it causing the transfer lever 344 to be correspondingly rocked either clockwise or counterclockwise about its pivot 345. Thus, transfer of signals occurs during the time that the pivot rod 345 is being thrust upwardly by a bell crank carrier including one arm 348 pivoted on the rock shaft 349 from which there extends another arm 351 that terminates with a follower roller 352. The bell crank assembly 348351 is actuated by a cam 353 which is also supported upon and rotated with the record reader operating cam shaft 229.

The bail 324 mentioned above is also actuated by shaft 229 through the instrumentality of an ear 354 formed at its remote end as viewed in Fig. 5, to which is connected one end of a link 355 whoseother end is pivoted at 356 at an intermediate point upon the tape feed actuator arm 225. A follower roller of said follower arm 225 is actuated by a cam on shaft 229 and is pivoted at 223, upon which pivot is also carried a supporting lever 222 whose extremity carries the tape feed pawl 221.

Upon the counterclockwise movement of the tape feed stroke of lever 222, link 355 is pulled downwardly causing bail 324 to be rotated clockwise and causing its extremity 323 to rock disc 311 counterclockwise. If none of the selectable elements 261 is conditioned, spring 322 may thereafter return disc 3 I 1 withdrawing the contact actuating arm 319 and permitting the contact pair 321 to close. However, in the event that one of the elements 261 is at the time selected, return movment of the disc 311 is for a moment-prevented because of the blocking of one of its probing teeth or projections 31B and contact pair 321 is then held open.

Referring again to the transfer lever 344, it will be noted that the lowermost extremities thereof are provided with circular discs 359, each one of which is received within a parallelly sided slot 361 of a corresponding connecting rod 362. Each rod 362 is articulated at its left end by means of a retaining clip 363 and a suitable slot to one of the code discs 314 so that the movement (right wardly or leftwardly) communicated to the con necting rod by the transfer lever 344 results in a corresponding clockwise or counterclockwise shifting of its associated code disc 314.

Alongside the connecting rods 362, Figs. 3 and 6, is a parallelly shiftable bar 364 resembling generally the class of connecting rods 362 at its end whereat it is articulated to the stripper disc (not shown), but terminating at a point short of the rightward extremity of said general class of rods with a disc and socket connection associated with one of the levers 365 pivoted at 366 to a stationary part 361 of the tape sensing unit. The upper end of lever 365 terminates with a follower roller 369, Fig. 6, which rides the periphery of a cam 368, also carried on shaft 229. The purpose of cam 368 is, through lever 365, to rock the stripper disc of the code disc assembly following each selection in order to restore any one of the selected elements 261, which had been selected during the preceding cycle, to its normal position preparatory to a subsequent selection.

and be rotated by it through a slight angle in a counterclockwise direction. As a result, there is withdrawn the opposite end 315 of lever 313 permitting the contactor 316 to be closed for achieving a purpose which will be described later.

General operation In order to illustrate the relationship of the various components which comprises the mechanical embodiment of the invention just described, a concise description of a typical operating cycle will now be reviewed in conjunction with the exemplary circuit illustrated in the .accompanying Fig. 4. Symbolic representations of certain mechanical details have been employed in order to suggest the particular structural embodiments which were shown in the mechanical adaptation. The reference character 334, indicates an outgoing line, which it is presumed, is connected to a receiving printer of the type illustrated in U. S. Patent No. 2,249,040. This line at the transmitting station is traceable through the contact pair 333, which effects signaling by producing regulated and periodic interruptions, thereafter continues over a conductor 311, measured resistance 318, to the battery lead 313.

Resistance 318 is provided for the purpose of dividing the signaling current until it is sufficiently below that supplied by grounded line battery 500 in order that, when this resistance 318 is shunted out by the operation of switch 313 afore-described, the higher voltage may be applied to the line for the purpose of thereby effecting periodically a phase regulating strong impulse, which when received by the printer mechanism as disclosed in U. S. Patent No. 2,249,040 will be characteristically effective upon the phase regulating magnet discolsed in said patent under the reference character 43. Upon the receipt of this regulating impulse, the magnet 43 which is always connected to line but is only marginally responsive to current stronger than ordinary signal strength effects an operation causing its armature to be disposed in the path of a cyclically rotatable wheel. Thereafter at the termination of this impulse, the wheel is permitted to resume rotation and thus phase adjustment is obtained at a critical instant in the printer cycle which is in precise phase relationship with a corresponding instant at the transmitting station apparatus.

Upon the occurrence of the particular code combination in the control form which efiects the alignment of the notches 31I, Fig. 8, which code combination preferably is supplied at regular intervals, 9. synchronizing impulse is thereby obtained by shunting out the resistance 318. The code bars 332 retain their setting following each signal and are reset from a preceding signal to assume directly the condition of a succeeding signal. As described in the printer patent referred to above, the phasing interval should be of suficient duration to afford ample opportunity for the type wheel to make at least one complete revolution, since the extreme out-of-phase relation between transmitter and receiver may be as much as but never more than one character less than the total number of characters which comprise the periphery of the type wheel. To compensate for this time delay, the control tape, during its preparation, is perforated with a succession of blank signals, that is, code combination signals having perforations in all positions, sufficient in number to equal the maximum phasing interval. This succession of blank signals is followed by an allotted code signal which effects the alignment of notches 3" on the connecting rods 332 and thereby operates the phasing su-' pervision.

Perforated tape, which is prepared in contemplation of the particular system, is threaded into a record reader mechanism 202 and thereafter it proceeds in a step-by-step manner presenting its transverse code perforations successively-to the proximity of the sensing pins. As the set of feeler levers 203 which carry the sensing pins is positioned cyclically, the transfer levers 334 transmit corresponding settings to the code discs 3. Upon the completion of an operating or signal cycle, shaft 223 is brought to rest by means of the restoration cam and follower roller 246 which thereupon returns arm 243 to clutch disengagement condition.

Assuming that the particular code relates to a selection for which a rod 23I has been provided rather than to one concerning which no rod is provided as discussed above, there will resulta selective displacement of said rod 26I un der the influence of the garter spring 308 or 303 which will displace the rod at its extremity I083 presenting the extremity thereof into the path of the revolving seeker projection I084, Figs. 2 and 3. Upon the succeeding operation of selector arm 251 when said arm traverses the proximity of the selector pin 26I thus conditioned, the butterfly 255 will be rocked thereby about its pivot rod 253 causing one or the other of its two vanes 328 or 323 to dislodge the associated storage pin 218 with which one or the other of saidv vanes happens to collide at the instance of effectiveness of such selector rod 26I. At the same time revolving contactor 254 is brought into engagement with the continuous ring 258 completing a circuit which may be traced in Fig. 4 from positive current over line 36I, continuous ring 258, by wire 262, revolving contactor 254, line 382, thence over line 384, manually controllable switch 385, line 386, winding of relay 381, line 388, resistances 333 and 3! to the junction point 332, line 333, thence to negative source.

Upon the completion of this circuit, relay 381 is energized pulling up its armatures 334 and 335. Armature 334 then closes with its contact point 338while armature 335 does so with its contact point 331. Contact pair 335331 thereupon completes a locking circuit for holding relay 381 closed which is traceable from plus current over line 38l to junction point 338, thence over line 333 to the junction point 40I, thence over line 402 through the (closed) contact pair 403, line 404, to the junction point 405, thence the locking circuit continues over path 406, the. contact pair 331-335, lines 401 and 408, lines 384, through the manual control switch 335, line 386, winding of relay 381, line 388, resistances 383 and 39 I, line 333 to negative current.

As a result of the closure of contact pair 334-333 a circuit is prepared for energizing the start magnet 253 which is traceable as follows:

From positive current supply of line "I, Junction 398, line 399, junction 401, line 402 through contact pair 403, line 404 to junction 405, line 409 to contact pair- 394-395, lines 4 and 2, through the winding of magnet 253, line 4 to the junction 392, and thence over line 393 to negative current.

Thus it is to be noted that relay 381 performs as a storage device, while at the same time its energization is contingent upon the closure of contactor 254 with ring 258 and that the latter operation may result only upon the selective conditioning of one of the elements 26L Since the record reader shaft is initiated by the magnet 253 while the latter is conditioned by the relay 381, the record reader mechanism 202 will therefore be understood to depend for its start impulse of each cycle upon the selection of an element 26l. Means are also provided for initiating the record reader mechanism in the event of a non-selecting signal in order that the tape may be advanced nevertheless and this is accomplished through the supervision of the disc 3l1 and its contact controlling arm 3 I 9.

Referring for the moment again to Fig. 8, it

will be recalled that upon the occurrence of a non-selecting signal, disc 3|1 is permitted to be rotated clockwise by a spring 322 until it attains a position whereat the contact pair 32| is permitted to close, completing a circuit for energizing a storage relay 381, traceable in Fig. 4, as follows: From positive current supply, over line 38! to the junction point 398, line 399 to the junction 401, switch to line 416, contact pair 32I (now closed), line 1 to junction 4H3, lines 408 and 384 to the manual switch 385, line 386, winding of relay 381, line 388, resistances 389 and 39! to junction 392, and thence over line 393 to negative current supply. As a result of the energization of relay 381 its armatures 394 and 395 are pulled up causing to be effected the record reader initiation by the resulting energization of start magnet 253 after the manner described above.

In each cas 5, whether in response to a selecting (one of the forty) signal or to a non-selecting (one of the twenty-four) signal, the record reader cycle continues until the locking circuit of relay 381 is opened and this is done by a cam 368 on the record reader shaft, acting through lever 365 and through the parallelly shiftable bar 364, causing to be shifted the control rod 4| 9, Fig. 6, until the contact pair 403 is opened. This not only breaks the locking circuit for relay 381 but also it restores the subordinated circuits to their normal condition preparatory to and in contemplation of a new cycle of operation.

The motor 233 is preferably of the synchronous type as is also the printer motor at the remote stations with which the present apparatus is designed to have communication, Where a common alternating current supply is not available for the use of both stations, a special power line may be provided or another suitable method that may be adapted to this System is one such as is described in U. S. Patent No. 2,237,951.

Fig. 6 shows an apparatus for adjusting the phase of the signals sent out over a line to that :f t-e alternating current supply source. Reference to Fig. 9 will now be had in order to illusirate what is meant by wave-signal orientation. The general reference character 50! designates a dimensional representation of a cyclic signal interval which may be considered as composed of a number (forty in the instant example) of component signal subintervals. During the transmission of the full signal interval, it is contem plated to occupy forty consecutive alternating current half waves or twenty full waves. The ap. paratus now to be described concerns means for accurately placing the cyclic signal so that each one of its component subintervals will coincide iii with an alternating current half wave.

Reference character 423 denotes one of two side frames pivotally supported on journals, carried concentrically with selector shaft 263 and sleeve 264. These side frames are provided with underhanging portions for supporting the pivot shaft 424 upon which driving coupling 213-214 is idly mounted. An auxiliary segment 425, secured to the side frame 422, is provided with teeth for meshing with a worm wheel 426. The latter member is secured to a horizontal shaft 421, one end of which carries the knurled adjustment knob 428. Also secured to shaft 421 is a star wheel 429 against whose periphery there is tensioned-a jockey roller or detent (not shown). By rotating shaft 421 one way or the other, segment 5 may be rocked clockwise or counterclockwise carrying with it the underhanging frame including the side members described above, and accordingly changing the angular position at which shaft 263 and sleeve 264 are relatively maintained. This rotation will shift the phase relationship of each signal to be generated to align with the alternating current supply so that a standard relative phase of transmission may be established and maintained and any setting thus obtained may be continued against a possibility of inadvertent changing through the operation of the holding jockey in cooperation with the start wheel 429.

While the present invention has been explained with reference to a particular set of embodiments, it is to be understood, nevertheless, that numerous modifications and variations may be introduced within the contemplation and spirit "f the present disclosures. It is accordingly intended that the scope of the present invention be not confined to the details in the accompanying ilustrations nor to the specific language contained in the foregoing specification except as designated in the hereunto appended claims.

What is claimed is:

1. In a telegraph transmitting device, a transmitting apparatus operated in regular consecutive cycles of identical time duration, apparatus responsive to a perforated control form, means controlled by said apparatus to transmit a variable number of character impulses during any one of said cycles, and means under the control of special perforations in said form to transmit a si nal for phasing a signal responsive receiving devic to the cycles of operation of said transmitting apparatus.

2. In a code perforatedtape controlled transmitter, means to transmit character signal impulses having a given electrical characteristic at certain instants in a cycle in response to a general class of permutation code perforations in a tape, and means to transmit a phasing signal having a different electrical characteristic under control of a predetermined special code perforation in a tape.

3. In a code translating transmitter, means to transmit a signal impulse of one electrical characteristic in response to a general class of permutation code control perforations in a tape, and means to transmit a phasing signal of a different electrical characteristic under control of a particular code perforation in a tape.

4. In a signal transmission system, a record reader mechanism responsive to perforations in a control form, a rotary signal generator including a plurality of impulse elements, means under the control of said record reader for conditioning said impulse elements, means to generate cyclically signal intervals having a number of characteristic impulses in each cycle in accordance with the conditioned ones of said impulse elements, and means responsive to a' special perforation in said control form for generating a signal impulse differing in electrical potential from said characteristic impulses.

5. In a signaling system, a signal transmitter including a plurality of conditionabl impulse elements, a mechanism responsive to perforations in a control form for conditioning said elements, cyclic means to generate signals in each cycle having a number of impulses and each having a periodicity in accordance with the conditioned ones of said elements, and a mean responsive to a special perforation in said control form for effecting a signal impulse differing electrically from said characteristic impulses.

6. In a signal transmission system, a transmitting distributor having a plurality of components each allocated to a signal characteristic of a code, means for operating said transmitter cyclically, means responsive to a perforated control form for conditioning each component to generate a signal characteristic impulse indicative, by its location in a cycle, of an intelligence character, and means under the control of special perforations in said form for transmitting a single impulse during each cycle differing electrically from said character impulses for establishing the phase relationship of a cyclically responsive receiving apparatus to the cycles of said transmission system.

7. In a signal transmission system, a rotary distributor having a plurality of components each relating to a character, means for operating said transmitter in cycles, means responsive to a perforated control form for conditioning each component to generate an electrical impulse indicative by its location in a cycle of a character, and means under control of special perforations in said form to transmit an impulse during each cycle differing in electrical characteristic from that of said character impulses for establishing the phase relationship of a receiving apparatus.

8. In a signal transmission system, a rotary distributor having a plurality of component signal elements each representing a code character, an apparatus responsive to generalsignals in a perforated control form for conditioning said elements for operation, means for transmitting one signal impulse in accordance with each conditioned one of said elements, and means under the control of a special perforation in said form for transmitting periodically a phase regulating impulse differing in electrical characteristic from that of said conditioned element signal impulses.

9. In a code translating and signal transmission system, a rotary distributor having a plurality of elements each representative of a code I character, an apparatus responsive to a perforated control form for conditioning the elements of said distributor, means effective during each rotation of said distributor for transmitting one or more signal impulses in accordance with conditioned ones of said elements, and means under the control of special perforations in said form and independent of control by said elements for transmitting periodicall a phase regulating impulse to regulate the rotation of receiving apparatus.

10. In a telegraph apparatus, a synchronous motor, a shaft driven by said motor, a signal impulsing device mounted on said shaft and driven by said motor including means for producing electrical current modifications coincident with the undulations of an alternating current supply source for driving said synchronous motor, a gear train between said motor and said impulsing device comprising a pair of integrally associated gears, and means to adjust for phase relationship between said motor and said device comprising an eccentrically supported jack shaft for said integrally associated gears. and apparatus for adjusting said jack shaft radially about said motor driven shaft and securing said jack shaft in variable angular adjustments.

11. In a telegraph apparatus, a synchronous motor driven shaft, a transmitting sleeve carried upon said shaft, a pair of integrally associated gears pivoted on a journal eccentric of said shaft and sleeve for imparting motion from said shaft to said sleeve, and a displaceable hanger for said journal includin deten table adjustment means for shifting and thereat securing phase coincidence between said sleeve and said motor driven shaft.

12. In a mechanical phase adjusting apparatus, a shaft rotated in synchronism with a source of alternating current, a signal impulse generator for producing line current changes coinciding in periodicity with the current alterations of said source, and a driving train between said shaft and said generator including an eccentrically supported jack shaft, and means for displacing said jack shaft radiall about said rotated shaft to thereby effect phase coincidence between said rotated shaft and said generator.

13. In a signal transmission system, a rotary distributor having a plurality of component elements, each relating to a character, means responsive to a perforated control form for conditioning said elements to effect correspondingly timed impulses indicative of characters by their periodicity in a cycle, and means under control of special perforations in said form to transmit a further impulse during each cycle differing in electrical characteristic from that of said character indicative impulses for effecting phase coincidence at a receiving apparatus.

14. In a telegraph apparatus, a synchronous motor, a shaft driven by said motor, a signal impulsing device mounted on said shaft and driven by said motor including means for producing electrical current modifications coincident with he undulations of an alternating current supply source for driving said synchronous motor, a gear train between said motor and said impulsing device comprising a pair of epicyclically arranged gears, and means to adjust for phase relationship between said motor and said device comprising an eccentricall supported jack shaft for said ep'cyclically arranged gears, and apparatus for adjusting said jack shaft radially about said motor driven shaft and securing said jack shaft in variable angular adjustments.

LOUIS M. PO'I'IS. 

